From what I can tell this should be solved by disabling software flow control (XON/XOFF), but I've tried that, several ways, and it still doesn't work. I've tried: running "stty -xon -xoff", entering "C-a, f" in screen (tried all modes: "+flow", "-flow", and ""+flow(auto)"), as well as using command line arguments for screen "-fn". None of it seems to fix the problem.